考虑转速影响的滚珠丝杠副摩擦系数计算与试验研究  

Calculation and Experimental Study on Friction Coefficient of Ball Screws Considering Speed Effect

作　　者：赵哲 欧屹[1] 孟军虎[2] 冯虎田[1] 周长光 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《摩擦学学报》2017年第6期784-790,共7页Tribology

基　　金："高档数控机床"国家科技重大专项"功能部件测试试验共性技术研究与能力建设"(2016ZX04004007)资助~~

摘　　要：针对目前滚珠丝杠副摩擦系数选取多以轴承经验值为依据的现状,基于滚珠丝杠副的结构特点建立滚珠与滚道的运动学及动力学模型,得到滚珠丝杠副摩擦系数与预紧力及摩擦力矩之间的关系,并推导出滚珠丝杠副摩擦系数计算公式.通过新型设计的预紧力可调机构可实现对双螺母滚珠丝杠副预紧力的任意加载与实时监测.利用该机构,结合摩擦力矩测量系统便可实现对滚珠丝杠副摩擦力矩和预紧力的直接测量,从而计算不同预紧力和转速下的实际摩擦系数.由于测量系统转速限制,试验在转速400 r/min以下的低速条件进行,最终得到摩擦系数随转速与预紧力的变化规律,并给出了滚珠丝杠副低速下摩擦系数的选用范围.通过试验得到合理的滚珠丝杠副摩擦系数取值对今后研究其摩擦特性有着重要的意义.Aiming at the present situation that the friction coefficient of the ball screw is chosen based on the bearing experience value and considering about the structural characteristics of the ball screw, the kinematics, dynamic model of the ball and the screw were established. Meanwhile, the principle of measuring friction coefficient was analyzed and a friction coefficient calculation method was derived. The novel preload-adjustable ball screw mechanism can achieve the adjust preload and real-time monitoring of the double nut ball screw. The drag torque and preload of ball screw, with this mechanism, can be measured directly through the drag torque measuring system, so that the actual friction coefficients at different preload and speed can be calculated. As a result of the measurement system rotational speed limit, the test was carried out at a low speed of 400 r/min or less. Finally the variation of the friction coefficient under the rotational speed and preload were obtained. The selection range of the friction coefficient under the low speed of the ball screw was given. It is important to research the friction coefficient of the ball screw through experiments.

关 键 词：滚珠丝杠 摩擦系数 摩擦力矩 预紧力 

分 类 号：TH117.1[机械工程—机械设计及理论]